Haruna-class destroyer

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The Haruna-class destroyer was a destroyer class built for the Japan Maritime Self-Defense Force (JMSDF) in the early 1970s. These helicopter-carrying destroyers (DDH) were built around a large central hangar which housed up to three helicopters. Originally, the Coastal Safety Force and its successor, the JMSDF, had intended to enable its fleet aviation operating capability. In 1960, the Defense Agency planned to construct one helicopter carrier (CVH) with the Second Defense Build-up Plan, but this project was shelved and finally cancelled because the JMSDF changed their plan to disperse its fleet aviation assets among destroyers, not concentrating them in a few helicopter carriers. The Japanese DDH was planned to be a hub with this dispersing fleet aviation concept with their logistics service capability for aircraft. Initially, equipment of this class was similar to that of the Takatsuki-class DDA. All weapons, two 5-inch/54 caliber Mark 42 (Type 73) guns and one Type 74 octuple missile launcher (Japanese version of the American Mark 16 GMLS), were settled on the forecastle deck. But with the Fleet Rehabilitation and Modernization (FRAM) program in 1983 and 1984, Sea Sparrow launchers, Phalanx CIWS systems and chaff launchers were added on the superstructure. The upgrade program also added the Naval Tactical Data System (NTDS) with the OYQ-6/7 combat direction system. The rear half of the superstructure was helicopter hangar, and the afterdeck was the helicopter deck with a beartrap system. To operate large HSS-2 ASW helicopters safely, the full length of the helicopter deck reached 50 meters.